9557922544921 has 3 divisors (see below), whose sum is σ = 9557925636511. Its totient is φ = 9557919453332.

The previous prime is 9557922544901. The next prime is 9557922544949. The reversal of 9557922544921 is 1294452297559.

The square root of 9557922544921 is 3091589.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 3108659133321 + 6449263411600 = 1763139^2 + 2539540^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9557922544921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9557922544901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1545795 + ... + 4637383.

Almost surely, 2^{9557922544921} is an apocalyptic number.

9557922544921 is the 3091589-th square number.

9557922544921 is the 1545795-th centered octagonal number.

It is an amenable number.

9557922544921 is a deficient number, since it is larger than the sum of its proper divisors (3091590).

9557922544921 is an frugal number, since it uses more digits than its factorization.

9557922544921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6183178 (or 3091589 counting only the distinct ones).

The product of its digits is 81648000, while the sum is 64.

Multiplying 9557922544921 by its sum of digits (64), we get a square (611707042874944 = 24732712²).

The spelling of 9557922544921 in words is "nine trillion, five hundred fifty-seven billion, nine hundred twenty-two million, five hundred forty-four thousand, nine hundred twenty-one".